Below-the-stem Junction A

Below-the-stem Junction A

Non-series components SM-EW90-A, SM-EW90-B

The External junction box A SM-EW90 used to be the junction box everyone had on their bikes. DURA-ACE 9150 introduced the EW-RS910 junction A, which has been the go-to junction box for any new bike since then.

While it is available in a 3 and 5-port version, the latter is rarely used and most people seem to opt for the 3-port version of the junction box.

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